1.

The solution set of (5 + 4 cos theta)(2 cos theta + 1) = 0 in the interval [0, 2 pi ] is

Answer»

`{(PI)/(3), (2PI)/(3)}`
`{(pi)/(3),pi}`
`{(2 pi)/(3), (4 pi)/( 3)}`
`{(2 pi)/(3), (5 pi)/(3)}`

ANSWER :C


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